Targeting NOX, INOS and COX-2 in inflammatory cells: chemoprevention using food phytochemicals

Area of Science:

• Biochemistry
• Immunology
• Molecular Biology

Background:

• Inflammatory leukocytes, such as macrophages, produce proinflammatory molecules in response to stimuli.
• Chronic activation of enzymes like NADPH oxidase (NOX), inducible nitric oxide synthase (iNOS), and cyclooxygenase-2 (COX-2) is linked to inflammatory diseases, including cancer.
• While synthetic agents are used for cancer prevention, natural compounds from herbs and spices also show potential in disrupting inflammatory pathways.

Purpose of the Study:

• To review the molecular mechanisms underlying the activation of NOX, iNOS, and COX-2.
• To highlight food phytochemicals that can regulate these key inflammatory molecules.
• To discuss the cancer-preventive potential of these phytochemicals.

Main Methods:

• Review of literature on molecular mechanisms of NOX, iNOS, and COX-2.
• Identification and analysis of food phytochemicals targeting these enzymes.
• Examination of studies on cancer prevention activities of phytochemicals in animal models.

Main Results:

• 1 '-acetoxychavicol acetate, found in Zingiberaceae, reduces NOX-derived superoxide generation and suppresses iNOS and COX-2 synthesis.
• This phytochemical attenuates nitric oxide and prostaglandin E(2) production.
• 1 '-acetoxychavicol acetate demonstrates significant cancer prevention activities in rodent models of inflammation-associated carcinogenesis.

Conclusions:

• Food phytochemicals offer a promising avenue for regulating key inflammatory molecules involved in carcinogenesis.
• Targeting NOX, iNOS, and COX-2 with natural compounds like 1 '-acetoxychavicol acetate may be effective in cancer prevention strategies.
• Further research into phytochemicals can lead to novel approaches for managing inflammatory diseases and preventing cancer.